Instant dissolving device by mass transfer and stretching with a cleaning structure and a dissolving method thereof

ABSTRACT

Disclosed are an instant dissolving device by mass transfer and stretching with a cleaning structure and a dissolving method thereof. The dissolving device consists of a liquid inlet, a stretching repetition unit and a mass transfer unit, the stretching unit is sequentially composed of an upper fixed fluted disc, a movable fluted disc and a lower fixed fluted disc all with a plurality of through holes, and the upper fixed fluted disc and the lower fixed fluted disc are fixed to the dissolving device housing; the polymer gel solution is formed into a “uniform” solution after passing through the mass transfer unit. The dissolving device in the present invention is easy to install, and achieves instant dissolution of the polymers and improves the dissolution efficiency through the joint action of forced stretching and mass transfer by high gravity.

CROSS-REFERENCE TO RELATED APPLICATIONS

The application claims priority to Chinese patent application No.202210405477.2, filed on Apr. 18, 2022, the entire contents of which areincorporated herein by reference.

TECHNICAL FIELD

The present invention pertains to a rapid polymer dissolving method, inparticular to an instant dissolving device by mass transfer andstretching with a cleaning structure and a dissolving method thereof.

DESCRIPTION OF PRIOR ART

As one of the important methods for enhanced oil recovery in oilfielddevelopment, polymer flooding has been widely applied to onshoreoilfields at home and abroad. However, the injected water is highlymineralized and contains a lot of calcium and magnesium ions due to thelack of fresh water resources in offshore oilfields. The traditionalpartially hydrolyzed polyacrylamide has low salt resistance and lowviscosity, failing to meet the requirements of offshore oil fields. Witha small number of hydrophobic groups on its main chain, the solution ofhydrophobically associating polymer is characterized with reversiblethree-dimensional mesh structure, sound shearing dilutability andinjectability, strong shear resistance, and high viscosity. It is highlyviscous in highly mineralized water containing a lot of calcium andmagnesium ions, and suitable for application in offshore oilfield wherethere is a lack of freshwater resources. The advantages ofhydrophobically associating polymer are more prominent in reservoirswith high formation permeability and high crude oil viscosity. Too longtime required for mixing and curing of hydrophobically associatingpolymers at room temperature (20° C. to 25° C.) restricts itsapplication in offshore oilfields greatly. Therefore, aiming at theactual mine conditions of offshore oilfields, the study of acceleratingthe dissolution velocity of hydrophobically associating polymer is ofgreat significance for polymer-based technologies to enhance the oilrecovery of offshore oilfields.

Currently, the solubility of hydrophobically associating polymers hasbeen studied, and it takes over 120 min to dissolve the hydrophobicallyassociating polymers with existing methods, which means that asignificant number of large curing tanks are required to ensure thecomplete dissolution of the polymers and that it is almost impossible toapply polymer flooding for offshore platforms with limited space andload-bearing capacity, especially for existing small offshore platforms.

The Online Quick Dissolution Research Group of the Enhanced Oil RecoveryLaboratory of Southwest Petroleum University has proposed an idea ofsetting up screens or orifice plates of different apertures withappropriate spacing inside the pipeline to strip and cut swellingparticles, reduce the particle size of swelling particles, and shortenthe dissolution time, and demonstrated the feasibility of this idea. In2006, a field amplification test was conducted, in which a cyclicapproach was adopted to strip and cut the swelling polymer particlesseveral times, resulting in a significant reduction in the polymerdissolution time. However, the repeated cutting of polymer molecularchains led to chain breakage and solution viscosity reduction;meanwhile, the swelling particles blocked the screen s or orificeplates, which cannot meet the requirements of polymer preparation andinjection on offshore platforms. Therefore, it is badly in need of aninstant hydrophobically associating polymer dissolving device withsimple structure and convenient operation to accelerate the dissolutionvelocity and shorten the dissolution time of the hydrophobicallyassociating polymer, making its solution suitable for field application.

The purpose of the present invention is to provide a device foraccelerating the swelling particle dissolution of hydrophobicallyassociating polymers that can achieve on-site docking, with suchadvantages as simple installation, small floor area, light weight andhigh processing capacity.

SUMMARY OF THE INVENTION

In view of this, it is the purpose of the present invention to providean instant dissolving device by mass transfer and stretching with acleaning structure and a dissolving method thereof, wherein the deviceconsists of a liquid inlet, a stretching repetition unit and a masstransfer unit; the stretching unit is sequentially composed of an upperfixed fluted disc, a movable fluted disc and a lower fixed fluted discall with a plurality of through holes; the upper fixed fluted disc andthe lower fixed fluted disc are fixed to the dissolving device housing;the surface of the upper and lower fixed fluted discs close to themovable fluted disc is of a short tooth structure, and is evenly engagedwith the short tooth structure on both sides of the movable fluted disc;the stretching unit is repeatedly set from top to bottom in series, andalso provided with a transmission shaft and a motor; a cleaningstructure is set below the stretching unit and a mass transfer unit isset around the periphery of the stretching unit; the mass transfer unitcomprises an inner ring and an outer ring that can rotate reverselyaround the same axis; the polymer gel is formed into a “uniform”solution after passing through the mass transfer unit. The dissolvingdevice in the present invention is easy to install, and achieves instantdissolution of the polymers and improves the dissolution efficiencythrough the joint action of forced stretching and mass transfer by highgravity.

To achieve the above purpose, the following technical solutions wereused:

-   -   An instant dissolving device by mass transfer and stretching        with a cleaning structure consists of a housing, a liquid inlet,        a stretching repetition unit, a mass transfer unit, a cleaning        unit and a liquid outlet; the stretching repetition unit, the        mass transfer unit and the cleaning unit are arranged inside the        device housing, and the liquid inlet and outlet are provided on        the housing; the polymer solution flowing from the stretching        unit or the mass transfer unit is connected to the polymer        outlet provided in the lower part of the mass transfer unit        through a channel;    -   The stretching repetition unit is sequentially composed of an        upper fixed fluted disc, a movable fluted disc and a lower fixed        fluted disc all with a plurality of through holes; the upper        fixed fluted disc and the lower fixed fluted disc are fixed to        the transmission shaft or the dissolving device housing; the        surface of the upper fixed fluted disc and the lower fixed        fluted disc close to the movable fluted disc is of a short tooth        structure, and is evenly engaged with the short tooth structure        on both sides of the movable fluted disc; the diameter of the        fixed fluted disc is not greater than the diameter of the        movable fluted disc, and the stretching repetition unit is        repeated in series from top to bottom, and also provided with a        transmission shaft and a motor; the number of stretching        repetition units is defined as n (n≥1);    -   A cleaning unit is arranged below the stretching unit and        connected with the transmission shaft, and rotates in opposite        direction of with the movable fluted disc of the stretching unit        through a coaxial reverser to clean the polymer gel layer        adhered to the lower fixed fluted disc; the cleaning unit is        arranged below each stretching repetition unit or below the        entire stretching unit, and the bottom plate of the mass        transfer unit is kept a certain distance from the lower fixed        fluted disc, so as to store the polymer gel solution scraped off        by the cleaning unit;    -   A mass transfer unit is arranged around the periphery of the        stretching unit; the polymer enters the mass transfer unit after        being processed by the stretching unit; the mass transfer unit        is composed of k layer(s) of mass transfer ring (k≥1); the        polymer solution passes through the porous material provided on        the mass transfer ring for transfer by penetrating and flows out        of the mass transfer ring which is connected with, separated        from, or combined with the stretching unit; the mass transfer        ring is movably arranged on the device housing, the transmission        shaft of the stretching unit, or the transmission shaft or the        external motor;    -   If connected with the stretching unit, the mass transfer ring is        directly connected to the outer ring wall of the upper and lower        fixed fluted discs of the stretching unit, forming an integrated        cylinder with the stretching unit, and the mass transfer ring is        kept stationary as the upper and lower fixed fluted discs;    -   If set apart from the stretching unit, the mass transfer ring is        rotated by a coaxial reverser or a separate motor in the axis of        the transmission shaft of the stretching unit; the adjacent mass        transfer rings all rotate in the opposite direction, and the        innermost separated mass transfer ring rotates in the opposite        direction with the movable fluted disc of the stretching unit; a        bottom plate is arranged under the mass transfer ring, and a        spacing is left horizontally between adjacent mass transfer        rings, so that the polymer is pulled in the opposite direction        in different mass transfer rings;    -   If set in combination with the stretching unit, the mass        transfer ring is first directly connected to the outer ring wall        of the upper and lower fixed fluted discs of the stretching        unit, forming an integrated cylinder with the stretching unit;        the mass transfer ring is kept stationary as the upper and lower        fixed fluted discs, and the rest separated mass transfer rings        are set apart from the stretching unit and rotated by a coaxial        reverser or a separate motor in the axis of the transmission        shaft of the stretching unit; the adjacent separated mass        transfer rings all rotate in the opposite direction, and the        innermost separated mass transfer ring rotates in the opposite        direction to the movable fluted disc of the stretching unit; a        bottom plate is arranged under the speared mass transfer ring,        and a space is left in the horizontal direction between adjacent        mass transfer rings, so that the polymer is pulled in the        opposite direction in different mass transfer rings;    -   In order to reduce the volume while improving the reliability of        the device, the mass transfer ring is set apart from the tension        unit can be fixed in extreme cases.

Further, the movable fluted disc is of a short tooth structure, and theshort tooth is 3 to 5 cm in length, and the short tooth surface isdesigned with circular transition.

Further, the short tooth structure of the movable fluted disc and thelower fixed fluted disc is in a tooth shape, and the stretching unit isrepeatedly arranged in series from top to bottom; the transmission shaftis connected to the movable fluted disc, and the motor drives themovable fluted disc to rotate; the engagement gap between the upperfixed fluted disc and the movable fluted disc and between the movablefluted disc and the lower fixed fluted disc in each mass transfer unitis gradually reduced from top to bottom.

Further, a liquid inlet is added to the interval between the stretchingrepetition units in order to meet greater liquid dispensing requirement.

Further, the liquid inlet is connected with the stretching repetitionunit, the liquid inlet is arranged on the upper part of the stretchingunit, and the liquid outlet is arranged on the lower part of thehousing; the transmission shaft is connected to the upper motor outsidethe housing.

Further, the porous material is sand particle with different meshes,metal foam with different pore sizes, screen meshes with different poresizes, or one or more of the cellulose;

Further, if k is 1, the mass transfer ring is a single layer, anddirectly connected to the outer ring walls of the upper and lower fluteddiscs of the stretching unit, forming an integrated cylinder with thestretching unit, that is, the mass transfer ring is fixed to the outerring walls of the upper and lower fixed fluted discs of the stretchingunit; at this time, the mass transfer ring rotates in the same directionas the movable fluted discs of the stretching unit.

Further, if k is 2, the mass transfer ring includes inner and outerrings, and the mass transfer ring is separated from the stretching unit;the mass transfer ring is rotated by a coaxial reverser or a separatemotor in the axis of the transmission shaft of the stretching unit; theinner ring of mass transfer ring is rotated by a coaxial reverser or aseparate motor in the opposite direction with the movable fluted disc ofthe stretching unit; the outer ring is rotated reversely by a coaxialreverser or a separate motor; a bottom plate is arranged under the masstransfer ring, and a space is left in the horizontal direction betweenadjacent mass transfer rings, so that the polymer is pulled in theopposite direction in different mass transfer rings.

Further, if k is 3, the mass transfer ring is set in combination withthe stretching unit and is divided into a fixed ring, an inner separatedring and an outer separated ring; the fixed ring is directly connectedwith the outer ring walls of the upper and lower fixed fluted discs ofthe stretching unit, forming an integrated cylinder with the stretchingunit, that is, the mass transfer ring is fixed on the outer ring wallsof the upper and lower fixed fluted discs of the stretching unit; atthis time, the fixed mass transfer ring rotates in the same direction asthe movable fluted disc of the stretching unit; the inner separated ringand the outer separated ring are arranged separately; the separated masstransfer rings are rotated by a coaxial reverser or a separate motor inthe axis of the transmission shaft of the stretching unit; the innerseparated ring is rotated by a coaxial reverser or a separate motor inthe opposite direction to the movable fluted disc of the stretchingunit; the outer separated ring is rotated by a coaxial reverser or aseparate motor in the opposite direction to the inner separated ring; abottom plate is arranged under each separated mass transfer ring, and aspacing is left horizontally between adjacent mass transfer rings, sothat the polymer is pulled in the opposite direction in different masstransfer rings.

Further, the cleaning unit is a crosswise blade with a wave shape orserrated structure.

An instant dissolving method by mass transfer and stretching with acleaning structure is described as follows:

Firstly, start the motors of the device to drive the mass transfer ringsof the stretching unit, cleaning unit and mass transfer unit to rotate;pump in a mixture of dry polymer powder and water from the liquid inlet;the undissolved polymer mixed solution enters the upper part of thestretching unit from the liquid inlet for stretching; the solutionpasses through the stretching repetition unit and enters the upper fixedfluted disc and movable fluted disc from the through holes on the upperfixed fluted disc, and then flows from the movable fluted disc into thelow fixed fluted disc; due to the short tooth structure of the upperfixed fluted disc, the movable fluted disc and the lower fixed fluteddisc, the short tooth structure of the movable fluted disc and the lowerfixed fluted disc is in a tooth shape, and the stretching repetitionunits are repeatedly arranged in series from top to bottom; theengagement gap between the upper fixed fluted disc and the movablefluted disc and between the movable fluted disc and the lower fixedfluted disc in each stretching unit is gradually reduced from top tobottom, the movable fluted disc runs at a certain speed, the swellingpolymer particles are ground by the short teeth, then sheared again bythe tangential force generated in the stretching unit under thecentrifugal force, and centrifuged to the mass transfer ring of the masstransfer unit:

When the mass transfer ring is connected with the stretching unit, thepolymer is forced to pass through the mass transfer ring, thenpenetrates the porous materials of the mass transfer ring and flows outof the mass transfer ring; the liquid comes out from the side of themass transfer ring, then is connected to the outlet of the device, anddischarged from the device to form a dissolved “uniform” polymersolution;

When the mass transfer ring is set apart from the stretching unit,driven by the rotation of the rotating fluted disc, the incompletelydissolved polymer particles are thrown out in the radial direction underthe action of centrifugal force, then pass through the mass transferring set on the innermost ring under the action of hyper-gravitycentrifugation, and encounter the second ring that rotates in theopposition direction of the innermost ring in the spacing cavity betweenthe innermost ring and the second ring; the polymer is forcibly pulledback and forth when the second ring rotates reversely to make thepolymer molecular chain segments exposed and extended rapidly, and thenpasses through the second mass transfer ring and counter-rotates in thespacing cavity between the second and third rings; the gel polymer isforcibly pulled back and forth to make the polymer molecular chainsegments extended rapidly, and then passes through the mass transferring set on the third ring under the high gravity generated by therotation of the third ring, until it passes through all mass transferrings; the liquid comes from the side of the mass transfer ring, and isdischarged from the device to form a dissolved “uniform” polymersolution.

When the mass transfer ring is set in combination with the stretchingunit, the polymer is treated by the stretching unit and then forced topass through the mass transfer ring, penetrate the porous materials ofthe mass transfer ring, and flow out the mass transfer ring into theinnermost ring that is set apart; the polymer passes through the porousmaterial set on the innermost ring under the action of hyper-gravitycentrifugation; due to the reverse rotation in the spacing cavitybetween the innermost ring and the second ring, the polymer is forciblypulled back and forth to make the polymer molecular chain segmentsextended rapidly, then comes to and penetrate the second ring under theaction of high gravity; the gel polymer is forcibly pulled back andforth between the second and third mass transfer rings to make thepolymer molecular chain segments extended rapidly and transfer the massout of the third mass transfer ring, until it passes through all masstransfer rings; the liquid comes from the side of the mass transferring, and discharged from the device to form a dissolved “uniform”polymer solution;

When the mass transfer rings separately set are fixed, the polymer isforced to flow out from the mass transfer ring after passing through thestretching unit.

Beneficial Effects

The present invention has the following beneficial effects:

The device can quickly dissolve polymers, especially for hydrophobicallyassociating polymers. The unique association strengthens the interactionbetween their molecular chains. The device provides a combination formof forced stretching, mass transfer and stripping, greatly increasingthe contact area between polymer and water, so as to achieve instantdissolution. Moreover, it is advantaged by high injection capacity tomeet on-site demand, small floor area, low load, and high safety ininstallation and operation.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of the instant dissolving device by masstransfer and stretching with a cleaning structure in the embodiment ofthe present invention;

FIG. 2 is another structural diagram of the instant dissolving device bymass transfer and stretching with a cleaning structure in the embodimentof the present invention;

FIG. 3 is a top view of the instant dissolving device by mass transferand stretching with a cleaning structure in the embodiment of thepresent invention (without the motor and fixing rod);

FIG. 4 is a top view of movable fluted disc of the instant dissolvingdevice by mass transfer and stretching with a cleaning structure in theembodiment of the present invention;

FIG. 5 is an enlarged cross-sectional view of the short tooth structureof upper fixed fluted disc, movable fluted disc and lower fixed fluteddisc of the instant dissolving device by mass transfer and stretchingwith a cleaning structure in the embodiment of the present invention;

FIG. 6 is a top view of mass transfer unit of the instant dissolvingdevice by mass transfer and stretching with a cleaning structure in theembodiment of the present invention;

FIG. 7 is a schematic diagram of cleaning unit of the instant dissolvingdevice by mass transfer and stretching with a cleaning structure in theembodiment of the present invention;

FIG. 8 is a special structural diagram of the instant dissolving deviceby mass transfer and stretching with a cleaning structure in theembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In order to make the purpose, technical solutions and advantages of thepresent invention more clearly understood, the following is a furtherdetailed description of the invention in conjunction with theembodiments and accompanying drawings. It is to be understood that thepreferred embodiments described herein are only used to interpret thepresent invention and are not intended to limit the present invention.

The technical scheme of the invention is further explained withreference to the appended figures and the preferred embodiments.

Embodiment 1

In the technical scheme of the embodiment, two stretching repetitionunits are connected in series, that is, the two stretching repetitionunits are repeatedly set from top to bottom, that is, the number ofrepetition units is n=2. The working principle of the device with othernumber of stretching repetition units is similar, so it will not bedescribed again herein.

The embodiment is mainly described by the case where there is 1 or 2mass transfer rings in the mass transfer unit. The working principle ofthe device with other number of stretching repetition units is similar,so it will not be described again herein.

Other embodiments may be combined according to the followingembodiments, all of which fall within the protection scope of thepresent invention.

Embodiment 1: The stretching unit is composed of two stretchingrepetition units in series, and two mass transfer units are set byseparation.

FIG. 1 shows a structure diagram of the present invention. An instantdissolving device by mass transfer and stretching with a cleaningstructure consists of a liquid inlet (3), a stretching repetition unitand a mass transfer unit; the stretching unit is sequentially composedof an upper fixed fluted disc (5), a movable fluted disc (6) and a lowerfixed fluted disc (7) all with a plurality of through holes; the upperfixed fluted disc (5) and the lower fixed fluted disc (7) are fixed tothe dissolving device housing (4); the surface of the upper fixed fluteddisc (5) and the lower fixed fluted disc (7) close to the movable fluteddisc (6) is of a short tooth structure, and is evenly engaged with theshort tooth structure on both sides of the movable fluted disc (6); themovable fluted disc (6) is connected with the transmission shaft (2) anddriven to rotate by a motor (1). The stretching units are arranged andconnected in series from top to bottom. The movable fluted disc (6) isconnected with the transmission shaft (2) and driven to rotate by themotor (1). The stretching unit is provided with a liquid inlet (3) atthe top and a liquid outlet (13) at the bottom, the upper fixed fluteddisc (5) is fixed to the device housing (4) by a fixing rod (18), andthe lower fixed fluted disc (7) is fixed on the device housing (4) by afixing rod (17). The stretching unit also includes a transmission shaft(2) and a motor (1), where in the transmission shaft (2) is connected tothe movable fluted disc (6) and the motor (1) drives the movable fluteddisc (6) to rotate. A cleaning unit (24) is arranged below thestretching unit and connected with the transmission shaft (2), androtates in the opposite direction to the movable fluted disc (6) of thestretching unit through a coaxial reverser to remove the polymer geladhering to the lower fixed fluted disc (7) and tangentially scrap offthe polymer. A mass transfer unit is set around the periphery of thestretching unit, and composed of an inner ring (11) and an outer ring(10) that can rotate in reverse direction around the coaxial line.

In the first case: The inner ring (11) is driven to reversely rotatewith the movable fluted disc (6) by a coaxial reverser (not shown)arranged on the transmission shaft (2), and the outer ring (10) is alsodriven to reversely rotate with the inner ring (11) by a coaxialreverser (not shown) arranged on the transmission shaft (2); at thistime, there is only one motor for the stretching unit in the device;

In the second case: The inner ring (11) is driven to reversely rotatewith the movable fluted disc (6) by a coaxial reverser (not shown)arranged on the transmission shaft (2), and the outer ring (10) is alsodriven to reversely rotate with the inner ring (11) by an externalmotor; at this time, the device is provided with two motors;

In the third case: The inner ring (11) is driven to reversely rotatewith the movable fluted disc (6) by an external motor, and the outerring (10) is driven to reversely rotate with the inner ring (11) by acoaxial reverser (not shown) arranged on the transmission shaft (2); atthis time, the device is provided with two motors;

In the fourth case: The inner ring (11) is driven to reversely rotatewith the movable fluted disc (6) by an external motor, and the outerring (10) is driven to reversely rotate with the inner ring (11) by anexternal motor; at this time, the device is provided with three motors;

The inner ring (11) has a cavity (9) containing the polymer; theincompletely dissolved polymer particles are sheared by tangential forcegenerated in the stretching unit. The stretching unit throws the groundpolymer gel out to the mass transfer unit by centrifugal force. Thepolymer gel first enters the cavity (9) of inner ring (11). There is apolymer reverse pulling space (8) left between the inner ring (11) andthe outer ring (10), and porous materials are arranged on the inner ring(11) and the outer ring (10). On the one hand, the polymer passesthrough the porous materials of the inner ring (11) and outer ring (10)for transfer by shearing. The ground polymer gel is thrown out from thestretching unit to the mass transfer unit by centrifugal force. Thepolymer gel first enters the cavity of the inner ring (11). There is apolymer reverse pulling space (8) between the inner ring and the outerring, and porous materials provided inside the inner ring (11) and theouter ring (10). On the one hand, the polymer is stretched by the porousmaterials in the inner ring (11) and the outer ring (10). On the otherhand, the polymer is forcibly pulled back and forth by the reverserotation in the cavity (8) between the inner ring (11) and the outerring (10), the polymer molecular chain segment is extended rapidly, andthe polymer gel forms a “uniform” solution after passing through themass transfer unit, and the solution is connected with the polymeroutlet (13) set at the lower part of the mass transfer unit through thechannel (12). A polymer inlet (3) is set at the upper part of thestretching unit. (15) is the outer ring bottom plate and (16) is theinner ring bottom plate. The inner ring bottom plate (16) has a certaindistance from the lower fixed fluted disc (7) to store the polymer gelscraped off by the cleaning unit (24). When the inner ring (11) rotates,polymer gel is centrifuged by high gravity to pass through the inner andouter rings of the mass transfer unit, so to obtain a “uniform”solution.

When the inner ring (11) and outer ring (10) are driven to rotate by theexternal motor, (14) is the inner ring rotating transmission shaft andfixing rod, and the inner ring transmission shaft (14) is connected toexternal motor. A slide is set on the device housing and used to fix theouter ring (10) with the pivot points (19) that are arranged with equalspacing. The slide is driven by the motor to rotate along the housing(4), so as to drive the outer ring (10) to rotate reversely.

In another case, the inner ring (11) is driven by an external motor orcoaxial reverser to rotate reversely with the stretching unit, and theouter ring (10) is fixed to the device housing with the fixing points.During operation, the outer ring (10) does not rotate, but the polymerin the cavity (8) between the inner ring (11) and the outer ring (10) isforcibly pulled back and forth after the rotation of the inner ring, thepolymer molecular chain segment is rapidly extended and the polymer gelis formed into a “uniform” solution after passing through the masstransfer unit.

In order to reduce the volume while improving the reliability of thedevice, the mass transfer ring is set apart from the tension unit can befixed in extreme cases. However, there will be loss in the amount ofpolymer solution.

A liquid inlet is added to the interval between the stretchingrepetition units in order to meet greater liquid dispensing requirement.

Dissolution method: Firstly, start the motors of the device to drive themovable fluted disc (6), cleaning unit and each mass transfer ring ofmass transfer unit to rotate; pump a mixture of dry polymer powder andwater from the liquid inlet (3); fill the aqueous solution of theincompletely dissolved polymer into each stretching unit from the liquidinlet (3) for stretching; the aqueous solution of the polymersequentially enters the upper fixed fluted disc (5) and the movablefluted disc (6) from the through holes on the upper fixed fluted disc(5), and then enters the lower fixed fluted disc (7) from the movablefluted disc (6); due to the short tooth structure of the upper fixedfluted disc (5), the movable fluted disc (6) and the lower fixed fluteddisc (7), the short tooth structure of the movable fluted disc (6) andthe lower fixed fluted disc (7) is in a tooth shape, and the masstransfer repetition units are repeatedly arranged in series from top tobottom; the engagement gap between the upper fixed fluted disc (5) andthe movable fluted disc (6) and between the movable fluted disc (6) andthe lower fixed fluted disc (7) in each mass transfer unit is graduallyreduced from top to bottom; the movable fluted disc (6) runs at acertain speed, and the incompletely dissolved polymer particles arecrushed by the short tooth structure to form swelling particles withlarger surface area; the swelling particles are centrifuged into theinner ring cavity (9) of the mass transfer unit by the centrifugal forceof the stretching unit; driven by the rotation of the inner ring (11),the swelling polymer particles are thrown out in the radial directionunder the action of hyper-gravity centrifugation, then pass through theporous material set on the inner ring (11) and encounter the outer ring(10) with reverse rotation which is set in the spacing cavity betweeninner ring (11) and outer ring (10); due to the reverse rotation of theouter ring (10), the polymer is forcibly pulled back and forth by thereverse rotation of the outer ring (10); the polymer molecular chainsegments are rapidly stretched and continually centrifuged through theporous material set on the outer ring (10) under the high gravitygenerated by the outer ring rotation, and the liquid comes out from theside of the outer ring (10), then is connected to the outlet of thedevice, and discharged from the device to form a dissolved “uniform”polymer solution.

When the mass transfer rings separately set are fixed, the polymer isforced to flow out from the mass transfer ring after passing through thestretching unit.

FIG. 2 shows another structure diagram of the present invention. Aninstant dissolving device by mass transfer and stretching with acleaning structure consists of a liquid inlet (3), a stretchingrepetition unit and a mass transfer unit; the stretching unit iscomposed of an upper fixed fluted disc (5), a movable fluted disc (6)and a lower fixed fluted disc (7) all with a plurality of through holes;the upper fixed fluted disc (5) and the lower fixed fluted disc (7) arefixed to the dissolving device housing (4); the surface of the upperfixed fluted disc (5) and the lower fixed fluted disc (7) close to themovable fluted disc (6) is of a short tooth structure, and is evenlyengaged with the short tooth structure on both sides of the movablefluted disc (6); the stretching repetition units are repeatedly set fromtop to bottom, the upper fixed fluted disc (5) is fixed to the devicehousing (4) by a fixing rod (18), and the lower fixed fluted disc (7) isfixed on the device housing (4) by a fixing rod (17). The stretchingunit also includes a transmission shaft (2) and a motor (1), where inthe transmission shaft (2) is connected to the movable fluted disc (6)and the motor (1) drives the movable fluted disc (6) to rotate. Acleaning unit (24) is arranged below the stretching unit and connectedwith the transmission shaft (2), and rotates in the opposite directionto the movable fluted disc (6) of the stretching unit through a coaxialreverser to remove the polymer gel adhering to the lower fixed fluteddisc (7) and tangentially scrap off the polymer. A mass transfer unit isset around the periphery of the stretching unit, and composed of aninner ring (11) and an outer ring (10) that can rotate in reversedirection around the coaxial line, and the inner ring (11) has a cavity(9) containing the polymer. The ground polymer gel is thrown out fromthe stretching unit to the mass transfer unit by centrifugal force. Thepolymer gel first enters the cavity of the inner ring (11). There is apolymer reverse pulling space (8) between the inner ring and the outerring, and porous materials provided inside the inner ring (11) and theouter ring (10). On the one hand, the polymer is stretched by the porousmaterials in the inner ring (11) and the outer ring (10). On the otherhand, the polymer is forcibly pulled back and forth by the reverserotation in the cavity (8) between the inner ring (11) and the outerring (10), the polymer molecular chain segment is extended rapidly, andthe polymer gel forms a “uniform” solution after passing through themass transfer unit, and the solution is connected with the polymeroutlet (13) set at the lower part of the mass transfer unit through thechannel (12). A polymer inlet (3) is set at the upper part of thestretching unit. (15) is the outer ring bottom plate and (16) is theinner ring bottom plate. The inner ring bottom plate (16) has a certaindistance from the lower fixed fluted disc (7) to store the polymer gelscraped off by the cleaning unit (24). When the inner ring (11) rotates,polymer gel is centrifuged by high gravity to pass through the inner andouter rings of the mass transfer unit, so to obtain a “uniform”solution.

At this time, the inner ring (11) is driven to rotate by directlyconnecting the transmission shaft (2) and the motor (1), and the innerring (11) is driven by the transmission shaft (2) to rotate in theopposite direction of the movable fluted disc (6) of the stretching unitthrough the coaxial reverser;

A slide is set on the device housing and used to fix the outer ring (10)with the pivot points (19) that are arranged with equal spacing. Theslide is driven by the motor to rotate along the housing (4), so as todrive the outer ring (10) to rotate reversely. The outer ring is alsodriven to reversely rotate with the inner ring (11) by a coaxialreverser arranged on the transmission shaft (2).

In another case, the inner ring (11) is driven by an external motor orcoaxial reverser to rotate reversely with the stretching unit, and theouter ring (10) is fixed to the device housing with the fixing points.During operation, the outer ring (10) does not rotate, but the polymerin the cavity (8) between the inner ring (11) and the outer ring (10) isforcibly pulled back and forth after the rotation of the inner ring, thepolymer molecular chain segment is rapidly extended and the polymer gelis formed into a “uniform” solution after passing through the masstransfer unit.

A liquid inlet is added to the interval between the stretchingrepetition units in order to meet greater liquid dispensing requirement.

In use, firstly start the motors of the device to drive the movablefluted disc (6), cleaning unit and each mass transfer ring of masstransfer unit to rotate; pump a mixture of dry polymer powder and waterfrom the liquid inlet (3); fill the aqueous solution of the incompletelydissolved polymer into each stretching unit from the liquid inlet (3)for stretching; the aqueous solution of the polymer sequentially entersthe upper fixed fluted disc (5) and the movable fluted disc (6) from thethrough holes on the upper fixed fluted disc (5), and then enters thelower fixed fluted disc (7) from the movable fluted disc (6); due to theshort tooth structure of the upper fixed fluted disc (5), the movablefluted disc (6) and the lower fixed fluted disc (7), the short toothstructure of the movable fluted disc (6) and the lower fixed fluted disc(7) is in a tooth shape, and the mass transfer repetition units arerepeatedly arranged from top to bottom; the engagement gap between theupper fixed fluted disc (5) and the movable fluted disc (6) and betweenthe movable fluted disc (6) and the lower fixed fluted disc (7) in eachmass transfer unit is gradually reduced from top to bottom; the movablefluted disc (6) runs at a certain speed, and the incompletely dissolvedpolymer particles are crushed by the short tooth structure to formswelling particles with larger surface area; the swelling particles arecentrifuged into the inner ring cavity (9) of the mass transfer unit bythe centrifugal force of the stretching unit; driven by the rotation ofthe inner ring (11), the swelling polymer particles are thrown out inthe radial direction under the action of hyper-gravity centrifugation,then pass through the porous material set on the inner ring (11) andencounters the outer ring (10) with reverse rotation which is set in thespace (8) between inner ring (11) and outer ring (10); the swellingparticles are pulled back and forth by the reverse rotation of the outerring (10); the polymer molecular chain segments are rapidly stretchedand continually centrifuged through the porous material set on the outerring (10) under the high gravity generated by the outer ring rotation,and the liquid comes out from the side of the outer ring (10), then isconnected to the outlet (13) of the device, and discharged from thedevice to form a dissolved “uniform” polymer solution.

When the mass transfer rings separately set are fixed, the polymer isforced to flow out from the mass transfer ring after passing through thestretching unit.

FIG. 3 ) shows the top view of the instant dissolving device by masstransfer and stretching with a cleaning structure (excluding the motor,fixing rod and upper fixed fluted disc). It can be seen that thestretching unit is symmetrically set with the transmission shaft (2),and after the upper fixed fluted disc is removed, (6) is the movablefluted disc. A mass transfer unit is set around the periphery of thestretching unit, and composed of an inner ring (11) and an outer ring(10) that can rotate in reverse direction around the coaxial line, andthe inner ring (11) has a cavity (9) containing the polymer. The groundpolymer gel is thrown out from the stretching unit to the mass transferunit by centrifugal force. The polymer gel first enters the cavity ofthe inner ring (11). There is a polymer reverse pulling space (8)between the inner ring and the outer ring, and porous materials providedinside the inner ring (11) and the outer ring (10). On the one hand, thepolymer is stretched by the porous materials in the inner ring (11) andthe outer ring (10). On the other hand, the polymer is forcibly pulledback and forth by the reverse rotation in the cavity (8) between theinner ring (11) and the outer ring (10), the polymer molecular chainsegment is extended rapidly, and the polymer gel forms a “uniform”solution after passing through the mass transfer unit. (19) is the pivotpoint between the outer ring and the housing slide, (13) is the polymersolution outlet, (12) is the polymer channel, and the polymer isconnected through the channel (12) and the outlet (13).

FIG. 4 ) shows the top view of the movable fluted disc of the instantdissolving device by mass transfer and stretching with a cleaningstructure. The movable fluted disc (6) is driven by the transmissionshaft (2). The incompletely dissolved polymer particles are crushed bythe short tooth structure (62) to form swelling particles with largersurface area and flow out of the through hole (61).

FIG. 5 ) shows the enlarged cross-sectional view of the short toothstructures of the upper fixed fluted disc, movable fluted disc and lowerfixed fluted disc of the instant dissolving device by mass transfer andstretching with a cleaning structure.

Each stretching repetition unit is set with upper fixed tooth (20) andmovable tooth (21); the engagement gap between the lower fixed tooth(22) and the movable tooth (21) is consistent, that is, the engagementgap between the upper fixed fluted disc, movable fluted disc and lowerfixed fluted disc of each repetition unit is the same. The stretchingunit is composed of identical stretching repetition units in parallel,that is, the short tooth structure of the movable fluted disc and thelower fixed fluted disc is trapezoidal: The upper fixed tooth (20) ofthe upper fixed fluted disc (5) is combined with the moving tooth (21)of the movable fluted disc (6) to form a primary-stage instantdissolution structure; the upper fixed tooth (20) and the movable tooth(21) are engaged with each other, with an engagement gap (23) that is2.45 mm at the upper inlet and 0.45 mm at the lower outlet; theengagement gap of 0.45 mm is 5 mm deep. The movable tooth (21) of themovable fluted disc (6) is combined with the lower fixed tooth (22) ofthe lower fixed fluted disc (7) to form a secondary-stage instantdissolution structure; the movable tooth (21) and the lower fixed tooth(22) are engaged with each other, with an engagement gap (23) that is1.32 mm at the upper inlet and 0.15 mm at the lower outlet; theengagement gap of 0.15 mm is 5 mm deep. With the above bipolar instantdissolution structure, the dissolved particles are forcibly stretched toobtain smaller size, which is better than that with only a fixed fluteddisc and a movable fluted disc; after treated by two identicalstretching repetition units arranged in series, the polymer gel becomesswelling particles with small size, laying the foundation for thesubsequent treatment by mass transfer unit.

FIG. 6 shows the top view of the mass transfer unit of the instantdissolving device by mass transfer and stretching with a cleaningstructure; the mass transfer unit consists of mass transfer rings, whichis divided into an inner ring (11), an outer ring (10), a cavity (9) ofthe inner ring containing the polymer, and a space (8) between the innerring and the outer ring; the outer ring and the inner ring rotate inreverse, and porous materials are provided between the inner ring andthe outer ring; when the polymer gel passes through the inner ring andthe outer ring, it is stretched through the porous materials and formeda “uniform” polymer solution more quickly.

The specific method is described as follows: The swelling particlestreated by the stretching unit enter the inner ring cavity (9) of themass transfer unit; driven by the rotation of the inner ring (11), theswelling polymer particles are thrown out in the radial direction underthe action of hyper-gravity centrifugation, then pass through the porousmaterial set on the inner ring (11) and encounter the outer ring (10)with reverse rotation which is set in the space (8) between inner ring(11) and outer ring (10); the swelling particles are pulled back andforth by the reverse rotation of the outer ring (10); the polymermolecular chain segments are rapidly stretched and continuallycentrifuged through the porous material set on the outer ring (10) underthe high gravity generated by the outer ring rotation, and the liquidcomes out from the side of the outer ring (10), then is connected to theoutlet (13) of the device through the channel (12), and discharged fromthe device to form a dissolved “uniform” polymer solution.

FIG. 7 shows a schematic diagram of the cleaning structure of theinstant dissolving device by mass transfer and stretching with acleaning structure which is provided with wave-shaped or serratedcrosswise blade; the cleaning unit (24) is connected to the transmissionshaft (2) and rotates in the opposite direction to the movable fluteddisc (6) of the stretching unit through a coaxial reverser to remove thepolymer gel adhering to the lower fixed fluted disc (7) and tangentiallyscrap off the polymer.

FIG. 8 shows another structure diagram of the present invention. Aninstant dissolving device by mass transfer and stretching with acleaning structure consists of a liquid inlet (3), a stretchingrepetition unit and a mass transfer unit; the stretching unit iscomposed of an upper fixed fluted disc (5), a movable fluted disc (6)and a lower fixed fluted disc (7) all with a plurality of through holes;the upper fixed fluted disc (5) and the lower fixed fluted disc (7) arefixed to the dissolving device housing (4); the surface of the upperfixed fluted disc (5) and the lower fixed fluted disc (7) close to themovable fluted disc (6) is of a short tooth structure, and is evenlyengaged with the short tooth structure on both sides of the movablefluted disc (6); the stretching repetition units are repeatedly set fromtop to bottom, the upper fixed fluted disc (5) is fixed to the devicehousing (4) by a fixing rod (18), and the lower fixed fluted disc (7) isfixed on the device housing (4) by a fixing rod (17). The stretchingunit also includes a transmission shaft (2) and a motor (1), where inthe transmission shaft (2) is connected to the movable fluted disc (6)and the motor (1) drives the movable fluted disc (6) to rotate. Acleaning unit (24) is arranged below the stretching unit and connectedwith the transmission shaft (2), and rotates in the opposite directionto the movable fluted disc (6) of the stretching unit through a coaxialreverser to remove the polymer gel adhering to the lower fixed fluteddisc (7) and tangentially scrap off the polymer.

Mass transfer units are arranged in the periphery of the stretchingunit. The mass transfer unit is a single-layer mass transfer ring (11)that is connected to the stretching unit. The mass transfer ring (11) isdirectly connected to the outer ring walls of the upper and lower fixedfluted discs of the stretching unit, forming an integrated cylinder withthe stretching unit. The mass transfer ring (11) is kept stationary asthe upper and lower fixed fluted discs; porous materials are arranged onthe mass transfer ring (11); the polymer reaches the inner side of themass transfer ring through the stretching unit under the action ofcentrifugal force, and forced to pass through the mass transfer ring(11); the polymer molecular chain segment is rapidly extended and thepolymer gel is formed into a “uniform” solution after passing throughthe mass transfer unit, and the solution is connected with the polymeroutlet (13) set at the lower part of the mass transfer unit through thechannel (12); a polymer inlet (3) is set at the upper part of thestretching unit, and polymer gel scraped off by the cleaning unit (24)directly enters the discharge device at the outlet (13).

A liquid inlet is added to the interval between the stretchingrepetition units in order to meet greater liquid dispensing requirement.

In use, firstly start the motors of the device to drive the movablefluted disc (6) and cleaning unit (24) to rotate; pump a mixture of drypolymer powder and water from the liquid inlet (3); fill the aqueoussolution of the incompletely dissolved polymer into each stretching unitfrom the liquid inlet (3) for stretching; the aqueous solution of thepolymer sequentially enters the upper fixed fluted disc (5) and themovable fluted disc (6) from the through holes on the upper fixed fluteddisc (5), and then enters the lower fixed fluted disc (7) from themovable fluted disc (6); due to the short tooth structure of the upperfixed fluted disc (5), the movable fluted disc (6) and the lower fixedfluted disc (7), the short tooth structure of the movable fluted disc(6) and the lower fixed fluted disc (7) is in a tooth shape, and themass transfer repetition units are repeatedly arranged from top tobottom; the engagement gap between the upper fixed fluted disc (5) andthe movable fluted disc (6) and between the movable fluted disc (6) andthe lower fixed fluted disc (7) in each mass transfer unit is graduallyreduced from top to bottom; the movable fluted disc (6) runs at acertain speed, and the incompletely dissolved polymer particles arecrushed by the short tooth structure to form swelling particles withlarger surface area; the swelling particles are centrifuged to the innerside of the mass transfer ring (11) of the mass transfer unit by thecentrifugal force of the stretching unit and forced to pass through themass transfer ring (11); the polymer molecular chain segment is rapidlyextended and the polymer gel is formed into a “uniform” solution afterpassing through the mass transfer unit, and the solution is connectedwith the polymer outlet (13) set at the lower part of the mass transferunit through the channel (12); a polymer inlet (3) is set at the upperpart of the stretching unit, and the polymer gel scraped off by thecleaning unit (24) directly enters the discharge device at the outlet(13).

With the disclosure of the above embodiments, those skilled in the artcan adopt the different numbers of stretching repetition units, thedifferent setting methods of mass transfer ring and the differentnumbers of combined devices as needed, all of which fall within theprotection scope of the present invention and will not be detailedherein.

Comparative Example

For the Comparative Example, the efficient polymer preparation deviceand the assembly method thereof disclosed in CN110860250A are adopted,with the technical solution described as follows:

The invention discloses an efficient polymer preparation device and anassembly method thereof, including an input manifold, a tubulardissolving device for a forced polymer stretching, an output manifoldand a multistage mass transfer and deepening instant polymer dissolvingdevice, wherein the tubular dissolving device for a forced polymerstretching comprises a motor, an upper end seat, a tubular dissolutionhousing, a lower end seat, a transmission shaft arranged axially in thetubular dissolution housing, and a plurality of dissolution unitsarranged in parallel in the tubular dissolution housing; the motor isaxially arranged on the upper end seat and connected to the transmissionshaft; the input and the output manifolds are both closed at one end andopen at the other end; the open end of the output manifold is connectedwith the multistage mass transfer and deepening instant polymerdissolving device, and a polymer outlet is provided on the multistagemass transfer and deepening instant polymer dissolving device. Featuredby simple installation, high processing capacity, light weight, smallfootprint, the preparation device can effectively accelerate polymerdissolution and can be used in polymer oil drive technology on offshoreplatforms.

Please refer to the CN110860250A document for specific structure,because there is an efficient polymer preparation device recorded inCN110860250A document, specifically a forced stretching dissolvingdevice mounted with a multistage mass transfer device. However, itsmultistage mass transfer device is fundamentally different from that inthe present application, and its mass transfer ring cannot rotate,whereas the mass transfer ring in the present application can rotate inthe opposite direction to that of the movable fluted disc near thestretching movable fluted disc, the outer ring of the mass transfer ringrotates in the opposite direction to the inner ring, all adjacent masstransfer rings rotate in the opposite direction to each other, and thestretching unit and mass transfer unit are set together, so that thepolymer particles brought out by the rotation in the stretching unit canquickly dissolve the polymer evenly under the pulling effect of thereverse rotation of the mass transfer ring. As for the efficient polymerpreparation device described in prior art CN110860250A, the stretchingdevice is separated from the mass transfer device, which cannot providea better synergistic effect; moreover, the mass transfer ring cannotrotate, and adjacent mass transfer rings cannot rotate in the oppositedirection, resulting in a slower polymer dissolution velocity. In a casestudy of AP-P4 polymer, taking water quality of SZ36-1 reservoir inBohai Sea as reference:

With the same volume, when the preparation concentration of the presentapplication is 2,000 mg/L, the preparation speed is twice as fast asthat of the Comparative Example.

According to the preparation and injection requirements, the maximumpreparation concentration in the present application can be 20,000 mg/Lin case of constant preparation speed and equivalent device volume.

However, in the Comparative Example, the maximum preparationconcentration is only 5,000 mg/L in case of constant preparation speedand equivalent device volume.

Therefore, in the present application, after ground by the stretchingmovable fluted disc, the polymers are thrown out to contact thereversely rotating mass transfer ring directly, and then the polymersare dispersed quickly under the pulling force generated by reverserotation. Moreover, the adjacent mass transfer rings are rotatingreversely and continually pulling in the reversely rotating space toquickly disperse the polymers into a uniform solution, which is atechnical solution unavailable in the prior art and completely differentfrom the prior art, making great progress.

To sum up, disclosed are an instant dissolving device by mass transferand stretching with a cleaning structure and a dissolving methodthereof, wherein the device consists of a liquid inlet, a stretchingrepetition unit and a mass transfer unit; the stretching unit issequentially composed of an upper fixed fluted disc, a movable fluteddisc and a lower fixed fluted disc all with a plurality of throughholes; the upper fixed fluted disc and the lower fixed fluted disc arefixed to the dissolving device housing; the surface of the upper andlower fixed fluted discs close to the movable fluted disc is of a shorttooth structure, and is evenly engaged with the short tooth structure onboth sides of the movable fluted disc; the stretching unit is repeatedlyset from top to bottom in series, and also provided with a transmissionshaft and a motor; a cleaning structure is set below the stretching unitand a mass transfer unit is set around the periphery of the stretchingunit; the mass transfer unit comprises a mass transfer ring that canrotate reversely around the same axis; the polymer gel is formed into a“uniform” solution after passing through the mass transfer unit. Thedissolving device in the present invention is easy to install, andachieves instant dissolution of the polymers and improves thedissolution efficiency through the joint action of forced stretching andmass transfer by high gravity.

The above are not intended to limit the present invention in any form.Although the present invention has been disclosed as above withpreferred embodiments, it is not intended to limit the presentinvention. Those skilled in the art, within the scope of the technicalsolution of the present invention, can use the disclosed technicalcontent to make a few changes or modify the equivalent embodiment withequivalent changes. Within the scope of the technical solution of thepresent invention, any simple modification, equivalent change andmodification made to the above embodiments according to the technicalessence of the present invention are still regarded as a part of thetechnical solution of the present invention.

What is claimed is:
 1. An instant dissolving device by mass transfer andstretching with a cleaning structure, consisting of a housing, a liquidinlet, a stretching repetition unit, a mass transfer unit, a cleaningunit and a liquid outlet; the stretching repetition unit, the masstransfer unit and the cleaning unit are arranged inside the devicehousing, and the liquid inlet and outlet are provided on the housing;the polymer solution flowing from the stretching unit or the masstransfer unit is connected to the polymer outlet provided in the lowerpart of the mass transfer unit through a channel; The stretchingrepetition unit is sequentially composed of an upper fixed fluted disc,a movable fluted disc and a lower fixed fluted disc all with a pluralityof through holes; the upper fixed fluted disc and the lower fixed fluteddisc are fixed to the transmission shaft or the dissolving devicehousing; the surface of the upper fixed fluted disc and the lower fixedfluted disc close to the movable fluted disc is of a short toothstructure, and is evenly engaged with the short tooth structure on bothsides of the movable fluted disc; the diameter of the fixed fluted discis less than the diameter of the movable fluted disc, and the stretchingrepetition unit is repeated in series from top to bottom, and alsoprovided with a transmission shaft and a motor; the number of stretchingrepetition units is defined as n (n≥1); A cleaning unit is arrangedbelow the stretching unit and connected with the transmission shaft, androtates in opposite direction of with the movable fluted disc of thestretching unit through a coaxial reverser to clean the polymer gellayer adhered to the lower fixed fluted disc; the cleaning unit isarranged below each stretching repetition unit or below the entirestretching unit, and the bottom plate of the mass transfer unit is kepta certain distance from the lower fixed fluted disc, so as to store thepolymer gel solution scraped off by the cleaning unit; A mass transferunit is arranged around the periphery of the stretching unit; thepolymer enters the mass transfer unit after being processed by thestretching unit; the mass transfer unit is composed of k layer(s) ofmass transfer ring (k=3); the porous material is provided on the side ofthe mass transfer ring, and the polymer solution passes through theporous material provided on the mass transfer ring for transfer byshearing and flows out of the mass transfer ring which is combined withthe stretching unit; the mass transfer ring is movably arranged on thedevice housing, the transmission shaft of the stretching unit, or thetransmission shaft or the external motor: If set in combination with thestretching unit, the mass transfer ring is first directly connected tothe outer ring wall of the upper and lower fixed fluted discs of thestretching unit, forming an integrated cylinder with the stretchingunit; the mass transfer ring is kept stationary as the upper and lowerfixed fluted discs, and the rest mass transfer rings are set apart fromthe stretching unit and rotated by a coaxial reverser or a separatemotor in the axis of the transmission shaft of the stretching unit; theadjacent separated mass transfer rings all rotate in the oppositedirection, and the innermost separated mass transfer ring rotates in theopposite direction to the movable fluted disc of the stretching unit; abottom plate is arranged under the speared mass transfer ring, and aspace is left in the horizontal direction between adjacent mass transferrings, so that the polymer is pulled in the opposite direction indifferent mass transfer rings; the mass transfer ring is set incombination with the stretching unit and is divided into a fixed ring,an inner separated ring and an outer separated ring; the fixed ring isdirectly connected with the outer ring walls of the upper and lowerfixed fluted discs of the stretching unit, forming an integratedcylinder with the stretching unit, that is, the mass transfer ring isfixed on the outer ring walls of the upper and lower fixed fluted discsof the stretching unit; at this time, the fixed mass transfer ringrotates in the same direction as the movable fluted disc of thestretching unit; the inner separated ring and the outer separated ringare arranged separately; the separated mass transfer rings are rotatedby a coaxial reverser or a separate motor in the axis of thetransmission shaft of the stretching unit; the inner separated ring isrotated by a coaxial reverser or a separate motor in the oppositedirection to the movable fluted disc of the stretching unit; the outerseparated ring is rotated by a coaxial reverser or a separate motor inthe opposite direction to the inner separated ring; a bottom plate isset under each separated mass transfer ring, and a spacing is lefthorizontally between adjacent mass transfer rings, so that the polymeris pulled in the opposite direction in different mass transfer rings. 2.The instant dissolving device by mass transfer and stretching with acleaning structure according to claim 1, wherein the movable fluted discis of a short tooth structure, and the short tooth is 3 to 5 cm inlength, and the short tooth surface is designed with circulartransition; the short tooth structure of the movable fluted disc and thelower fixed fluted disc is in a tooth shape, and the stretching unit isrepeatedly arranged in series from top to bottom; the transmission shaftis connected to the movable fluted disc, and the motor drives themovable fluted disc to rotate; the engagement gap between the upperfixed fluted disc and the movable fluted disc and between the movablefluted disc and the lower fixed fluted disc in each mass transfer unitis gradually reduced from top to bottom.
 3. The instant dissolvingdevice by mass transfer and stretching with a cleaning structureaccording to claim 1, wherein a liquid inlet is added to the intervalbetween the stretching repetition units in order to meet greater liquiddispensing requirement.
 4. The instant dissolving device by masstransfer and stretching with a cleaning structure according to claim 1,wherein the liquid inlet is connected with the stretching repetitionunit, the liquid inlet is arranged on the upper part of the stretchingunit, and the liquid outlet is arranged on the lower part of thehousing; the transmission shaft is connected to the upper motor outsidethe housing.
 5. The instant dissolving device by mass transfer andstretching with a cleaning structure according to claim 1, wherein theporous material is sand particle with different meshes, metal foam withdifferent pore sizes, screen meshes with different pore sizes, or one ormore of the cellulose.
 6. The instant dissolving device by mass transferand stretching with a cleaning structure according to claim 1, whereinthe cleaning unit is a crosswise blade with a wave shape or serratedstructure.
 7. A method of dissolving polymers using the instantdissolving device by mass transfer and stretching with a cleaningstructure according to claim 1, comprising the followings: Firstly,start the motors of the device to drive the mass transfer rings of thestretching unit, cleaning unit and mass transfer unit to rotate; pump ina mixture of dry polymer powder and water from the liquid inlet; theundissolved polymer mixed solution enters the upper part of thestretching unit from the liquid inlet for stretching; the solutionpasses through the stretching repetition unit and enters the upper fixedfluted disc and movable fluted disc from the through holes on the upperfixed fluted disc, and then flows from the movable fluted disc into thelow fixed fluted disc; due to the short tooth structure of the upperfixed fluted disc, the movable fluted disc and the lower fixed fluteddisc, the short tooth structure of the movable fluted disc and the lowerfixed fluted disc is in a tooth shape, and the stretching repetitionunits are repeatedly arranged in series from top to bottom; theengagement gap between the upper fixed fluted disc and the movablefluted disc and between the movable fluted disc and the lower fixedfluted disc in each stretching unit is gradually reduced from top tobottom, the movable fluted disc runs at a certain speed, the swellingpolymer particles are ground by the short teeth, then sheared again bythe tangential force generated in the stretching unit under thecentrifugal force, and centrifuged to the mass transfer ring of the masstransfer unit: The mass transfer ring is set in combination with thestretching unit, the polymer is treated by the stretching unit and thenforced to pass through the mass transfer ring, penetrate the porousmaterials of the mass transfer ring, and flow out the mass transfer ringinto the innermost ring that is set apart; the polymer passes throughthe porous material set on the innermost ring under the action ofcentrifugation; due to the reverse rotation in the spacing cavitybetween the innermost ring and the second ring, the polymer is forciblypulled back and forth, then comes to and penetrate the second ring underthe action of high gravity; the gel polymer is forcibly pulled back andforth between the second and third mass transfer rings to make thepolymer molecular chain segments extended rapidly and transfer the massout of the third mass transfer ring, until it passes through all masstransfer rings; the liquid comes from the side of the mass transferring, and discharged from the device to form a dissolved “uniform”polymer solution.